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Permian US English

Of, relating to, or denoting the last period of the Paleozoic era, between the Carboniferous and Triassic periods

the Permian in Permian US English

The Permian period or the system of rocks deposited during it

Permian Basin US English

A region in western Texas and the geologic structure underlying it, a major oil and gas reservoir. The cities of Midland and Odessa are production centers